Fix flaky test forwarding

[TylerJang27]

1. Remove the repo_tests uploading since it was broken and not necessary anyway (the only way it would fail incorrectly is due to a significant runner issue).
2. Coalesce KnownGoodVersion into Snapshots so that main and PRs use the same test name for "stable" (as opposed to Latest). This better normalizes this dimension of test variation.

Demonstration of correct naming (see comment below)

[trunk-io]

⏱️ 19m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
CodeQL-Build	5m	🟩 🟩 🟩
Repo Tests / Plugin Tests	4m	🟩 🟩 🟩
Windows Linter Tests	4m	🟥
Trunk Check runner [linux]	3m	🟩 🟩 🟩
Linter Tests ubuntu-latest	2m	🟥
Linter Tests macOS	2m	🟥
Detect changed files	32s	🟩 🟩 🟩
Aggregate Test Results	8s	🟩 🟥 🟩

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[trunk-staging-io]

💊 0 quarantined ✅ 0 passed 🕐 2 new ⋅ (learn more)

❌ 2 failed tests	status
Testing linter yamllint Linux main Snapshots > Testing linter yamllint test basic	❌
Testing linter yamllint Linux main Latest > Testing linter yamllint test basic	❌

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